Widely applicable background depletion step enables transaminase evolution through solid-phase screening

Planchestainer, Matteo; Hegarty, Eimear; Heckmann, Christian M.; Gourlay, Louise J.; Paradisi, Francesca (2019). Widely applicable background depletion step enables transaminase evolution through solid-phase screening. Chemical Science, 10(23), pp. 5952-5958. The Royal Society of Chemistry 10.1039/C8SC05712E

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Directed evolution of transaminases is a widespread technique in the development of highly sought-after biocatalysts for industrial applications. This process, however, is challenged by the limited availability of effective high-throughput protocols to evaluate mutant libraries. Here we report a rapid, reliable, and widely applicable background depletion method for solid-phase screening of transaminase variants, which was successfully applied to a transaminase from Halomonas elongata (HEWT), evolved through rounds of random mutagenesis towards a series of diverse prochiral ketones. This approach enabled the identification of transaminase variants in viable cells with significantly improved activity towards para-substituted acetophenones (up to 60-fold), as well as tetrahydrothiophen-3-one and related substrates. Rationalisation of the mutants was assisted by determination of the high-resolution wild-type HEWT crystal structure presented herein.

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